Improvement in sbwiwo-machinjb



cited taies Letters Patent No. 103,254,"1ated May 17, 1870.

IMPROVEMENT IN' SEWING-MACHINE.

The Schedule referred to in these Letters Patent and making parl: of the same.

To [all 'whom it may concern.-

`e it known that I, LEVI W. Srocnwnnn, of Akron, in the county of Summit and State of Ohio, have mvented certain new and useful Improvements iu Sewmg-Machines and I dohereby declare that the following is a full and complete description of the same,

reference being had to the accompanying drawings making part oi this spcciiicatin.

' Drawings. Figure 1 is a front view of the machine. Figure 2, a viewoi' the-top. Figure 3, an end view. Figure i is also an end view.

.Like letters of reference refer to like parts in the different'. views. i l

' Specification.

The object of this `invention relates to a device at' tached to a sewing-machine ofthe Wheeler 85 Wilson manufacture, whereby said machine is made to work a two-thread elastic ol1ain-stitch,or an ordinary 4single loch-stitch, at the will of .the operator.

' Said device consists-oi a slide attached to the under sidefof the cloth plate, and is operated by a double cam. Y.

The peculiar'movelnent of thefslide isobtained by certain slots,'into which project stationary/pins for guiding the movement of the'slide, whereby is operated a curved tubular needle, as hereinafter more fully described. Y

Fig. 1 represents a front view of the machine of the Wheeler 8c Wilson manufacture, in which- A is the needle.

B, the presser,

G, the cloth-platc.

I), the cam, for throwing up the feed-bar.

E, the rotating hook,y all ot' which `are ormay be constructed and operated in the ordinary way.

".lo the under side of the plate is attached a slide, F, iig. 2. A section of the plate is shown as broken away in order thatit may be seen.

Said slide is held in close relation to thc under side oi' the plate by means of stays G and H, the stay H being indicated by the dotted line a, under which the. 4slidchas a reciprocating lateral movement to a distance, but 4which is then deflected from such direct transverse movement by the angular slot I, proceedings-.from the slot J. By this means is obtained to the slide a direct transverse movement up to a certain point, and then' a. movement abruptly devia-ting therefrom. toward the needle, the purpose of' which will presently be shown.

To one endet' the slide Fis secured a curved tubular needle, K,`fig. 2, by means ofthe arm L, whereas to the opposite end ofthe slide is attached a stay, M, in which is closely but loosely tted a' pintle, N, fig. 3L

`To one end of said pintle is secured ahead of raw hide, O, embraced between the cheeks of the cam JP, iig. 1, and is by it actuated for operating the slide in 'its transverse, reciprocating, and angular'. movement,

as follows, viz:

The timely movement of the-slide F, when operated by thecam P and slots J and I, above described, is such that the tubular needle K, iig. 2, for carrying the under thread c, Figure 7, does not begin'to move into the loop of the upperthread, which is drawn down `by the rotating hook E, as shown in lig. 7, in which (t is the thread, until the previous loop b, iig. 4, is drawn up 'into the cloth, thereby'preventing the tubular. needle from"catching in the previous loops and breaking the thread.

Said needle moves in a straight line by virtue of the direct movement of the slide, until it arrives beyond thevneedle hole in thc cloth-plate. At this point it makes an abrupt angular movement, by virtue of the `angular slot I in the slide referredV to, toward the'iront of the machine, so that the needle A, in its downward "stroke, passes between the under thread c, Figures 5 and 7, and the tubular needle K.

Said needle does, in passing through the loop of the upper needle, pass near the side of the upper neeLdle, but it cannot come in contact therewith, for the reason that it enters the loopof the upper thread while the needle A is at the highest'pcint; hence there can be'no colliding of lthe two needles.

A It will be observed that the under thread passes throughV the tubular needle, and out oi' the extreme end thereof; hence its thread is carried back beyond the needle A, so as to insure its thread being caught by the needle A in its descent, or, in other words, to provide ample room for the needle A to pass between the thread and the tubular needle, in order to make the stitch, and without coming in contact with the feed-points a, Figures 5 and'G, or inany way interfering with a free movement of the thread.

Also, in consequence of the thread coming out at tween the feed-points and the end of said tubular needie, thereby avoiding all difiicnlty in adjusting the attachment to the machine.-

It will be obvious, fronrthe above description of the operation of the tubular lneedle', that it operates to form a stitch conjointly with the upper needle, the two needles sewing a double lock-stitch, sometimes called ai two-threaded elastic chain-stitch, which, forcertain kinds of work, is much more desirable than a ,single lock-stitch, the latter stitch being only the one made by this machine without having my attachment above described.

By this simple device, the machine is rendered capable of making both kinds of stitch, thereby eularging its capacity for various work and general 'usefulness.

This attachment may, as above said, be used or not, at the will of the operator, as it can be easily disengaged from the machine by withdrawing the head O- of the pintle N from its engagement with the cam, thereby allowing the machine to run independently of tle attachment, which will then sew the ordinary single lock-stitch.

. Claim.

What I claim as my improvement, and desire to secure by Letters Patent, is-

The curved needleK, mounted on the slotted slide F, arranged and operating in connection with the eyepointed nee'dle and revolving hook, substantially as and for the purpose specified.

LEVI W. STOCKWELL.

Witnesses:

W. H. BURRIDGE, FRANK S. ALBEN. 

